I'm not sure if this will help what you are trying to do, but I was able to get the full Java development environment on Fedora 21 64-bit by running these commands:
yum install -y java-1.8.0-openjdk
yum install -y java-1.8.0-openjdk-devel
For the browser plugin:
yum install -y icedtea-web
To turn on the Java Console:
System->Preferences->System->IcedTea-Web Control Panel